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How to Lock a PDF with a Secure Password
Updated 2026-02-18Verified Private
Sending tax returns or legal contracts via email? Always lock them with a password first to ensure only the intended recipient can read them.
Why is this needed?
Email is not secure. If an email is intercepted, a password-protected PDF remains unreadable without the secret key.
!Step-by-Step Instructions
1
Upload your PDF
Select the document you want to secure.
2
Set a Strong Password
Choose a unique password. We recommend 12+ characters with symbols.
3
Protect and Download
We'll encrypt your file using AES-256 bit encryption (the gold standard).
Pro Tips
- •Don't send the password in the same email as the PDF! Use a different channel like SMS or Slack.
- •A strong password should not contain your name or common words.
Frequently Asked Questions
Can Tulz recover my password if I forget it?
No. We do not store passwords. If you lose it, the file is unreadable forever.
Is AES-256 secure?
Yes. It would take a supercomputer millions of years to break it by brute force.